665341643 has 8 divisors (see below), whose sum is σ = 677160000. Its totient is φ = 653541448.

The previous prime is 665341613. The next prime is 665341657. The reversal of 665341643 is 346143566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 665341643 - 2¹⁴ = 665325259 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665341597 and 665341606.

It is not an unprimeable number, because it can be changed into a prime (665341603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84680 + ... + 92202.

It is an arithmetic number, because the mean of its divisors is an integer number (84645000).

Almost surely, 2^665341643 is an apocalyptic number.

665341643 is a deficient number, since it is larger than the sum of its proper divisors (11818357).

665341643 is a wasteful number, since it uses less digits than its factorization.

665341643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9081.

The product of its digits is 155520, while the sum is 38.

The square root of 665341643 is about 25794.2172395287. The cubic root of 665341643 is about 873.0013234835.

The spelling of 665341643 in words is "six hundred sixty-five million, three hundred forty-one thousand, six hundred forty-three".